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JOHN F. MYERS, NOAH LEAs,v AND WORLEY LEAs', OF KOKOMO; INDIANA.

Letters Patent No. 1,501, dated November 26, 18d?.

vIlillIRO'i/'Ell'liNT IN FURNACES FOR STEAMrBOILERS.

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To ALL WIIOM IT MAY -ooNoIIRm Be it known that we, J oHN F, MYERS, NOAH LEAs, and WonLnY LEAs, of Kokomo, in the county of How; ard, and State of Indiana, haveinyentedr. new and improved Furnace for Steam-Boilers; `and we do hereb)r l decla-re that the following is .a`full, clear, and exact description of the same,`referencebeing had to the annexed drawings, making part of. this specification, in Which- I I Figure 1 isa. perspective view, i Figure 2 is a vvertical cross-section, and Figure 3 is a vertical longitudinal section. Figure -L is a vertical section throughl the hearth and rear part of the boiler. The same letters are employed in all the figures in the indication of identical parts. A is the.furnace-Wall;` B is the tire-chamber, under-the front ot` the boiler; C is the chimney, into which the smoke passes .through the fines leading fromthe rear of the boiler. It is also connected, by the pipes 132,. -with the re-charnber. These pipes are ordinarily closed by a valvc,'D, but are' to beopened whenever the draught through the boiler-iues is cutoti`. D is the damper,` ivhieh is a flat sheet of metal, h'aYing the upper edge concave, so as to agzguinst' the sheli of. the boiler when ,the damper is raised. It is placedimmediately behind the `tire-chamber, and is'intendedfto `ent'oll' the draught, land prerentth'o passngeof'theheat to the rear end of the boiler, Whenever a reduction of temperature isdesired. .'It slides up and down, being controlled by the racks E, placed upon eacirend', and thepinions F, set upon a shaft turned by the winch Fl, outside the furnace-walls. A ratchet and pawl, F3, holds the damper'in place when raised. By raising the damper, and opening the valve Dl in the pipes D, the draught may be turned directly into-the chimney, and the boiler cooled by'opening doors opening through the furnace-walls, and admitting oo ld air to the exterior surface ofthe boiler, thus forming a. safeguard against the dan-ger ot'explosion. G is an open space below the front part of the hearth, and behind the damper, into which doors, G', are made to open, so that air may be admitted to the products ofcombustion on leaving the firc-chamber, supplying fresh oxygen, and promoting thc entire combustion of the inflammable products of the fuel. In order that the heat maybe brought into immediate contact with the boiler, thc back plate of thc rev box or bridge-wall is'inadc concave, to correspond with the forni of the boiler, as is also the hcnrth, extending from the damper back to the entlof -the boiler, leaving a space between them and the boiler ot, say, about six' inches, through which the heat passes, in close proximity to the shell of the boiler.v

What we claim'as our invention, and desire to secure by Letters Patent, is

1. The corhbinaltion of the 'rertically-sl-iding damper D, chu-mberG, and doors G', for the regulation :of the draught, said parts being arranged substantially as set forth.

2. The combination ,of the vertical sliding damper D with the pipes D2, havingralves D, when arranged to control the course of the draught, substantially as set forth.

in testmony whereof tv e'have signed our names to this specification in the presence of tivo subscribing Witnesses JOIIN F. MYERS,

NOAII LEAs,

Witnesses: WORLEY LEAs.

C. RICHMOND,

GEO. W. DEARINGER. 

